Apparatus for making v-belts



8, 1950 R. J. GORECKI 2,518,137

I APPARATUS FOR MAKING V-BELTS Filed March 5, 1947 5 Sheets-Sheet 1 I 41I my/ W ILL] I N VEN TOR. fo e7"! fiareciz' 1950 I R. J. GORECKI2,518,137

APPARATUS FOR MAKING V-BELTS Filed March 5, 1947 S Sheets-Sheet 2 Z w/MMM/j 4) INVENTOR. v Joerlloreclrz BY VZZ/ AZ// ya? 11/ a X 7 AugQS,1950 R. J. GORECKI APPARATUS FOR MAKING V-BELTS 5 Sheets-Sheet 5 FiledMarch 5, 1947 &

Aug. 8, 1950 R. J. GORECKI APPARATUS FOR MAKING V-BELTS Filed March 5,1947 5 Sheets-Sheet 4 INVENTOR. Zoberfjorectz 7%#o2-7zey= 8, 1950 R. J.GORECKI 2,518,137

APPARATUS FOR MAKING V-BELTS Filed March 5, 1947 5 Sheets-Sheet s IN VEN TOR. fiaer'z I Goreck z' ayzgaf;

Patented Aug. 8, 1950 APPARATUS FOR MAKING v-BELTs Robert J. Gorecki,Passaic, N.?J., assignor to Raybestos-Manhattan, Inc., Passaic, N.

ration of New Jersey J a corpo-.

Application March 5, 1947, Serial No. 732,437

This invention relates to improvements in a means-for manufacturingpower transmission belts, particularly belts ofthe V-type, that is, theusual trapezoidal sectioned belt, and refers specifically to a methodand means whereby the belt body, during moulding and curing, issubjected to a substantially constant predetermined radially appliedpressure which compensates for volume variations in the uncured belt.carcass.

Heretofore, in the-manufacture of belts of the character described, ithas been the practice to insert the uncured belt carcass into either acompletely enclosed mould of substantially constant volume and cure thesame therein under pressure-and heat, or to insert the carcass into athree-sided mould and establish pressure and heat in the mould, relyingupon the wrapping on the top face of the belt to confine the body'of thebelt upon fourth side of the belt.

In the first case hereinbefore mentioned, the

' mould being of constant volume depends for uniformity in beltproduction upon the volume of thecarcass. If thecarcass contains above apredetermined volume, the excess is-squeezed out of the juncture linesof vthe mould and requires sub-, sequent trimming. This operationinvolves the cutting ofthe belt cover which seriously reduces the wearresisting characteristics of the belt. In addition, the body of thebelt, particularly the strength members may be seriously distortedresulting. in an improperly tracking belt and also concentratingstresses on only a portion of the strength members. If the carcasscontains belowa predetermined volume, the body of the belt does notcompletely fill the mould and, hence, an improperly shaped and pressuredbelt results. In thefthree-side type of moulding operation, excess orinsufiicient volume of the carcass is refiecte'd upon the wrapped faceof the .belt and fre quently "results'in distortion or mal-positioningoffthe strength members resulting from non-uniferm strain rofrthewrappedunsupported face of, the beltifj 'The f present invention residesin a means for rndulding belts oij'the type described wherein the'a'r'cass'jorbodyfofv the belt issubjected tofsub stalntially constantpressure during"cure, pres-.

surizing'of the belt being accomplished substan-f tiall'y in incrementsthroughout the lengthof the belt at the inner radial face of the belt.This results in a beltwith its outer? and lateral faces fcl'eanlymoulded, its wrapping being uncut and the-strength members undistorted,or if 'moved,

being moved in a controlled manner. j v The-apparatus comprising myinvention may Claims. (01. 18-34) take a number of forms, all beingcharacterized by a mould having confining surfaces for the outer faceand lateral sides and having a resilient 'pressurizing element whichacts radially outwardly to compress the carcass during the curingperiod.

The objects and advantages of my invention will be more apparent fromthe accompanying drawings and following detailed description.

In the drawings, Fig. 1 is a vertical, sectional view, parts being shownin elevation, of a moulding machine upon which my invention may becarried out.

' Fig. 2 is a fragmentary, detail perspective view,"

parts being shown in section, of a belt carcass."

Fig. 3 is a fragmentary detail sectional view illustrating thecomplementary mould sections. Fig. 4 is a similar view showing a beltcarcass in th'e mould cavity prior to the application of radialpressure. 7

Fig. 5 is a similar view illustrating the parts in pressurizingposition.

Fig. 6 is a fragmentary plan sectional view taken on line 6-6 of Fig. 1.

Fig. '7 is a fragmentary sectional view illus trating a modifiedresilient pressure member.

Fig. 8 is a similar view illustrating another modified form of resilientpressure member.

Fig. 9 is a similar view illustratinga further modification of theinvention.

Fig. 10 is a similar view illustrating a mould cavity having a dihedralouter face portion.

Fig. 11 is a similar view illustrating a mould cavity having an arcuateouter face section.

- Fig. 12 is a fragmentary diagrammatic plan view of anothermodification of my invention.

Fig. 13 is a sectional view taken on line I3-l3 of Fig. 12.

Fig. 14 is a fragmentary enlarged sectional view of anothermodificationof my invention.

Referring in detail to the drawings, I indicates a moulding machinecomprising an embodiment of my invention. Machine I comprises a lowerplaten '2 which is provided with a plurality of communicating openings 3through which a heated' fiuid may bepassed to heat the body of theplaten. "The platen! issupported upon legs 4 and carries'a plurality ofvertically positioned standards or guides 5, which are secured togetherat their top portions by a spider or spacing member 6.

'Ihe memberli carries a cylinder 1, having a vertically movable pistonrod or ram 8 which projects through the supporting spider 6.

The

being in heat conductive relationship with respect to the lower platen 2whereby. the. heat of the fluid passing through the intercommunicat ingopenings 3, is conducted-tether section II.

The section II comprises the'inner. portion. of; a.

mould and has an inclined moulding surface l3,

which is adapted to form one. lateral wall of the.

belt, and a surface [4 which is 'a'daptedto'form the inner peripheralsurface of the belt;

A mould section I5 is secured, by means of cap screwsalfi, to thelowerface. of the upper platen 9, said .sectionbeing in :heat conductiverelation-. ship with respectto. the upper platen -9. The section 1 i 5.is. annular and 1 is adapted to. comprise the mating; portion of themould. consisting of.

sections H and I5. The section l5 is provided withan-inclined surfaceI'Lwhich is .adaptedto formthe opposite lateral face of the belt and isalso provided witha vertical face 18, which is adapted. td-f-orm theouter face of the. belt.

When the -.upper platenfl is lowered to operative position, the twocooperating portions of the mould comprising sections II and i5,providea trapezoidal sectioned. cavity I 19, as r shown best .in Fig.3..

A supporting plate 2!! is carried by means ofv bolts 2i-which arethreadedlyengaged intothe lower portion. of platens. The supportingplate ZDcarr-ies-a fluid=pressure cylinder 22- in which aspiston. (notshown) operates, said piston .be-ing operatively connected to piston rodor ram 23. At theencl ofthe pistonrodZB, aispide r is mounted whichcarries a plurality of radially. ex? tending-arms. '2 5,

A plurality of circularly disposed bifurcated an lugsQii. are mountedupon the supporting plate by means of bolts 21 whi-ch-alsopass throughthe, base portionZB of. the cylinder 22. A.bell crankiever. 29.ispivotally positioned asat in each pair of. lugs '26. One arm. 3i of eachlever 29 is pivotally connected to-a link 32, which at-,.its oppositeend is secured by means of'nuts 33 to oneof the arms 25 of spider 24.The cen tral portion of the lower platen .-2 is provided-with anaperture 34,.into which arms -35.of.the bell.

crank levers 2.9.extend. At the terminal endsrof the arms 35,rods3.6.areoperatively. engaged by.-

means of nuts 37.

The lower mould section H is provided -with an annular slot 38 whichopens into the mould cavity i9. Withinsaid slotvarpluralityofcircumferentiallyspacedsegments, 39 .are positioned. A. plurality. ofapertures. are provided in-the section. II. and one of said arms 36extends.

through each ofsa'id. apertures and is rigidly,-

Inthe manufacture of"V.-belts' o'f'the type.

contemplated herein, the uncuredjbeltcarcass is 4 built up of aplurality of layers of rubberized fabric 42, or said layers may compriserubber or a rubber composition. Positioned above the layers 42 are aplurality of strength members 43 which may comprise a plurality oflongitudinally extending cords, or may comprise wire strands, or ifdesired, said strength members may comprise :fabric, having the filler.threads thereof extendinglongitudinally ofthelength of the belt. A layer44 may be positioned above the strength :members 43 and may beconstructed of a materialsimilar. to the layers 42. Frequently, it isdesirable to surround the strength members 43 with a relatively soft:tie gum rubber 45.

. Inthmconstruction of the usual belt, the layers Mare frequentlyreferred to as the compression membersandthe layer 44 is referred to asthe tension member. The strength members 43 are the: elements whichwithstand the stress when the belt is placed in operation and normallysaid strength-members are disposed at oradjacent the neutral plane ofthe belt, that is, that portion cf the belt which, when the; belt isflexed around a pulley, is neither subjected to tension. nor.

compression. Over theassembly comprising the layers 42;, strengthmembers; '43 and layer-44,- one; or -more --fabrics wrappers 4&arepositioned. The;

wrappers :46: are frequently also rubberized.

The assembly hereinbefore described, is referred to as; the belt:carcass'xandqisgin the uncured state. being ofatrapezoidalcrosssection.However, said belt carcass may: be: of lsquareicrossw section. and maybe formed to trapezoidal. secticnduring the moulding operation.

pressing.

The carcass thus formed"-is endless and, when utilizingmy invention,said carcass-is positioned over the lowersmould section H so as toposition the inner portion 41 of the belt'in contact with thesurfaceI4'"-of the"mold section H, and-a side of the carcass in contactwith the inclined moulding surface i3-of said lower" section. Fluidunder pressure *is then introduced into the cylinder 7' andth'e uppermould section-is brought into post ti-on, thusconfiningthe carcass;hereinafter referredtdascarcass '48 inth-e cavity [9; as shown best inFig; 4. Tt'wfll be noted"thatthecarcass 48" may; whenthe upper "sectionI5 is brought downwardlyintoposition; he more or less looselydispose'd'within thecavityv 19, depending upon-the original volume. .ofthe carcass. However, frequently the carcass 48 is positioned snuglywithin thecavity 19, but squeezed'therein by means :of thepressure'established by the piston rod 8;

With theuppersection [5' in jtheposition shown in Fig. A, sum: under.pressure is introduced into the cylinder 22; thus, moving the pistonr0d.23 downwardly; "This movement of the piston rod rocks the bell cranklevers 29 about their pivot points 30, and, rods 36 are movedradiallyoutwardly,'thus moving spring 4| into pressure contact with the innerface 47 of the carcass. This action: of the machine is best illustratedin Fig. 5. It willbe noted that the spring 4i establishes pressureuponthe inner face 41 of the carcass and thus moves the remaining facesof the carcass into contact .with the faces1l3, I 4, l1 'andlBdefiningthe mouldicavity. In this manner a substantially constant.pressure is broughtto-bear. upon the carcass. Duringtl'ie. pressuri'zingoperation, the mould oomprisingthesections. lland l5is In:Fig;12.th'exbeltcarcass isillustrated as However, for purposes of;illustratingmyinvention the :belt carcass isshown as being/oftrapezoidalsection prior .to curing and asisnsz;

heated and simultaneously withthe pressurizing of the carcass, thebodythereofiscured.

The radial movement of the:rods 3.6 is relatively small as is alsothemovementofythe v1.. ds;32. Consequently, for all, practicalpurposes,v said rods may be considered as moving in straight lines.Consequently, the connections with rods .32 .to. the spider arms 25.maybe substantially rigid connections as may be the ,connectionsof rods36. to the When the belt has been properly cured, pressure is-relievedfrom the cylinder 22. thereby permit bell crank arms ting the bell cranklever arms-35 to move radially inwardly .underthe influence of springs,4 l.' 'How-v ever, if desired, fluid pressure may be established on thelower portion of the-piston within cylinder 22 to positively move-thebell cranklever arms 35- inwardly. In view of the factthat the spring isunder tension, said spring will-follow the inward movement of thesegments 39.' Q

Thesprings 4|, in view of the fact that diametrical'pressure isestablished upon the coils'the'ref of,-are constructed of suflicientlheavy wire as to withstand the pressure exerted bythe radially outwardmovement of the arms 36 and segments 39." I have found that incompressing and curing a belt carcass of-0.26 square inch cross section,a coil spring of 30 gauge wire is suitable, when exerting a pressure of350 pounds per square inch structed of rubber or other resilientmaterial may be employed instead of the band 49, the' band having adihedral face 5| which embeds itself into theinner face of the carcassduring thepressing' operation to establish constant pressure upon thecarcass.

*Referring particularly to Fig; 10, outer mould section I5 maybeisoconstructed as to have an outer face I8 in theform of a'dihedralangle. It is not necessary that the belt carcass be constructed with adihedral outer surface, since a belt carcass with a flat outer surfaceas shown in Fig. 2; may be positioned within the-mould cavity and whenpressure is established uponth'erods 36, said pressure will tend tocause the band member 49 to establish a degree of pressure within thebody of the belt sufiicient to displace the outer surface of the beltinto conformity with th'e'diliedral outer surface l8 of the section'l5'.

--'It will be notedpthat although the strength members 43 may have beendisposed. in a plane substantially parallel the outer face of the'belt,-the movement of the body of thecarcasswilltend. to displace the strengthmembers into planes'substari tially' parallel to the outer face I8 ofthe outer mould-section," as shown best at 52 in Fig. 10.,

It will be further noted that when the plane of the strength members is.normally 1 disposed. parallel to the outer face of thebeltj anda fiatouter surface I8 is used to form the'puter' su e face of the belt,substantially no movement'of the strengthmembers takes "place. fHowever, by.

employing aflatouter surfacecarcass in a mould cavity having a dihedralouter. surface l8, move ment of the strength members does take placebut, said, ovement und r; contifolledfcolilq normally under tensionwithin.

tions, so as to dispose the'plane of the strength.

members in a predeterminedmanner.

Referring particularly to Fig. 11,; an outer. mould sectionl5" is shownwherein outer sur-.

face l8 of .the mould cavity is arcnate. In utilizing this type of outer-mould section, the. belt carcass may be constructed with a flat outersurface as illustrated in Fig. 2, and when pres-I sure is establishedupon the spring tension mem-.

ber 41,, the outer surface of thecarcass will move into contact with thearcuate surface. l8".

surface of the carcass, the strength members will now be disposed in theform ofanarc which is substantially parallel to the outersurface l8. 0f;

the mould cavity. V Referring particularly to Figs. 12 and 13 of thedrawingsa modified means for operatively. mov.-.

ing the segments into pressurizlng position is shown. In View of thefact that the remaining. instrumentalities comprising the invention.re;-1

main the same, only those portions of the in-. vention which are changedwill be herein. described, it being understood that the remaining partsof the machine are similar.

In this form of my invention aflring is mounted .upon the upperface of.lower platen' Said ring is provided with a plurality of 2'.circumferentially spaced apertures 55, which :extend radially.Connecting members56 are slidably positioned in the apertures .55, theouter. ends of said connecting members being recessed to receive theends of rods 36, which may be secured to the connecting members 56 bymeans of set screws 51..

A disk 58 is rotatably mounted upon a shaft 59, which projects throughthe platen 2". The lower end of shaft 59 is connected to hub 69 of acrank arm 6|, said connection comprising a pin 62- which extendsdiametrically through hub and shaft 59. The opposite end of arm BI ispivotally connected as at 63 to a link M, which in turn, is pivotallyconnected as at 65 to piston rod 66. The piston rod 66 carries at itsendapiston (not shown) which operateswithin a pressure cylinder 61.

The disk 58 is provided with a plurality of;

arcuate apertures 68, the arc of said' apertures being eccentric withrespect to the disk. A fol-.

lower member 69 is carried upon each of the connectors 58, said followermembers being dis-;

posed within apertures 68. The arrangement is such that when a belcarcass 48 is positioned within the mould cavity and the upper and lowerplatens ar heated, the two sections of the moulding are brought togetheras hereinbefore described. Fluid under pressure is then introduced intothe upper ,por-

tion of the cylinder 6'! and the piston rod 66, through the. agency ofthe link 64, rocks the arm 6|; in a clockwise direction as viewed inFig. 12. This motion of the arm 6| rotates disk 58 which in turn causesthe connecting members56' to move radially outwardly thereby moving thesegments 39 into contact with the member M which, in turn, subjects theinner face of the carcass to pressure.

Referring particularly to Fig. 14, another, modification of my inventionis illustrated. In

this form of my inventiona platen H1, may comprise the lower platen of amachine similar in construction to the machine illustrated in Fig.1 lyvith the. excep ion t t. diffe nt. means Ashas been hereinbeforedescribed in conjunction. with the strengthmembers 53, whichmayini-1tiallyhave been in a planeparallel tothe outer.

aura-137' employed. for establishing radially outward pres sure uponthesegments. Alower mould H slmilar: to mould II, is positioned upon theupper surface of the platen") and is securedtheretos by means of boltsH, only one of which is shown. The platen 10 is providedwith. intercommunicating openings 12, through which a heated: fluid is adapted tobepassed to heatisa'id platen andalso heat: the lower mould ll.

Themould ll, similar to the. mould H', is of. annular. shape and isprovidedwith an annularnotch or open recess 13, in' which a plurality ofsegments .39" are positionedin. similar. fashion to the positioning ofsegments 39 in thelower mould section II. A band 49" similar-to bandi49,may be positionedinlthei'annular recess 13 in. circumscribingrelationshipzwith: respect to the segments 39.

A distributing member", which. maybe. circular. in shape, is secured tothe upper face :of'. platen v'lfltby means of bolts'lfi, onlyone of.which islshown, said member being disposed within the lower mouldsection III. A pipe 18 projects through opening Tlprovided'in the platenI and is threadedly positioned as'at l8 in the member 14. The pipe '16"opens into a cavity 19 in the central portion of the member 74, and fromsaid cavity a plurality of circumferentially spaced bores 80'extendradially, said bores being incom munication with the cavity '19.

Each of the bores 80 opens at its opposite'end intoa recess 8!. Therecess 8| opens outwardly to the outer peripheral surface of the memberI4 and is provided with an enlarged. portion 82 adjacent said outersurface; the'inner defining wall of the enlarged portion being threaded.

A piston assembly 83 is adapted to be positioned in each recess 8 I.Eachassembly. 8 lcomprises a plug member 84 which carries-externalthreadsadapted for engagement with the threads upon'the inner peripheryof the enlarged recess. 82. A piston 85 is carried by'the plug 84 and isof the type comprising an accordion wall 88 constructed of relativelyresilient metal. This'type of piston is well known and isusually'referred to as i a Sylphon piston.

The'center o-fthe plug 84 is provided'with': an aperture 86 in which apiston rod 81 .is slidably' positioned. Therod terminates in ahead'portion 88, which'is secured in fiuid'type relationship to the endWall of the piston 85. A coil spring 89 embraces rod 8! within thepiston 85-and abutsatone end against the plug 84, and at the oppositeend against the head 88 of the piston rod, whereby a force is exertedupon the piston' 85- tending to expandthe same in its normal state.

The opposite end of each piston rod 8Tprojectsradially outwardly fromeach plug 84 and is provided with screw threads 98. Rods 9| are mountedupon the segments 3? andproiect inwardly from the mould section H inalignment with each of the piston rods 8'l. The outerends of rods 9| arealso provided withscrewthreads 92. A sleeve-or turnbuckle 93 engages theends of the rods 81 and 9H, and in view of the fact that the threads 99and 92 are pitched in opposite directions, rotation of the sleeve 93-tends to bring the ends ofsaid rods closer togetheror remove themfurther apart, thus constituting an adjustment between the pistonrods-8'! and the segments 39-. It is to be understood, of course; thatalthough only one piston assembly is-illustrated, the member 14 isprovided with a plurality of such assemblies which arecircumferentially' spaced'from each other, there being one pistonassembly for each of the segments 39fl carried" by the mould section ll.

Inoperatiomthe-mould section 11 is employed in'coniunction.awithanupperor outer mould sec-- tionsimilar to the section 5, .and saidouter sec-'- tion is: carried upon a: pistoncactuat'ed platen: similarto: the 'p1atenl'9. It'can readily be seen thatiwhenil the: importerouter mould section I 5 is@ positioned overrth'ei lowerxor inner mouldsec.- tion I l, a mould cavity is provided similar to the cavity- 19.-Consequently,- if a belt carcassiisdi'sposed in saidmould cavity,-, itispositioned :to: re:-- ceiivezpressure -.which1 may be. exerted. upon thebandrl49 byrtheoutwardmovement of thevarious.

segments: 39:

In: operation: thepipe; 16, is connected. atits opposite end to azsourceof; fluid under pressure (not shownl :Thepressurefluid may comprisecompressed air; steam or: a liquid under hydraulic pressure. When fluidunder pressure isintroduced: into: thepipew16,-.said fluid. istransferred to theire'cess 8 I, thereby establishing a clifierentialpressure uponthe inner and outer. surfaces of? the .piston'85. Thepiston is accordinglycompressed. which causes. an outward: movement ofthe-rods 81 whichin-turn; is-tra-nsmittedto the:

segmentsiill In. this manner pressure is established uponthe band 49'which in turn bears upon the'inner surface of: the carcass positioned.

Within the mould cavity. After. the carcass carried in the mouldzcavityissubjectedto predetermined pressure and heat, the-fluid pressure inpiper 'lfilis released and each-of the piston rods 81 is.retractedradially inwardly. under the influence. ofsprings89. Thisaction retractsthe segments 3'91 7 and hence, pressureofthe .band49 uponthe carcass is relievedand the-carcassmay be read ily removedfrom themould cavity afterthe upper mouldsection has beensraised.

Refer-ringparticularly. to Fig. 9, another modification of my invention.is shown. In this form ofimy-invention 94 indicates the.lower or innermould section. andv 95 indicates: the. outer or upper mould section Whensaid sections are in member being. constructed of a material such asflexible rubber or the like. A.tube. 99 is positioned through a-wal'l ofthe inner mould sectionv Bland-opensv into the interior of the tubularmember. 98..as. shown bestatlflo in-Fig. 9.

In operation the .twomo-uld sections 94 and 95 are respectivelycarried-.by lower and upper heatedplatensofa press,- and consequently,said mould sections are heated. The belt carcass isinserted..-inthemould cavity St and theupper or outer mouldsection. 95is-Lbrought into/operative moulding positionwith respect to the lower orinner mould section. then introduced into the annular tubular member 98through the tube 99, thereby expanding the flexible walls of'the tubularmember 98.. The

expansion of.the tubular member 98establishes radial pressure upon theinner surface of the carcass carried in thecavity 98- and thus sub--jects said carcass, duringthe curing thereof, to a substantiallyuniformly distributed outward radial pressure; The fiuid'introduced intothe tubular memberv 98 maycomprise air' under pressure or may be ahydraulic fluid.

It willbeseen that herein is provided a means Fluid under pressure isv11-19 for moulding and curing transmission belts especially of theV-type. My invention is particularly characterized in that the belts areuniformly clensified during moulding and curing which results in a wellbalanced belt which runs true and will not tendto twist'during use. Myinvention is further characterized in that no trimlming of the belt isnecessary. after moulding and curing and the cover thereof remains.intact. Another advantage residing in my invention comprises the makingof a belt which is substantially uniformly incrementally weightedthroughout its lengthwhich resultsv in a'smootlllyrunning belt devoid ofuneven inertia eifects which are particularly noticeable and troublesomein fast movingbelts. I

I am aware that manymodifications of my invention may be madewithoutdeparting from the spirit of the invention'and, hence, I do not wish tobe limited except as necessitated-by the prior art.

- I claim as my invention:

LA device for'moulding *and curing transmission belts of the rubbertypewhich comprises in combination, a frame, a'pair of mating mould sectionscarried uponsaid frame'said sections when closed 'upon each othercomprising the defining walls of an annular mould cavity adapted for thereception of an endless belt carcass, one section defining a portion ofthe inner wall of the cavity and the other section defining the outerWall of the cavity, the mould section defining the inner wall of saidannular mould cavity being provided with an annular recess openin intosaid mould cavity, means in said recess for applying radial pressureupon the belt carcass in said cavity comprising a resilient coil springmember movable into contact with said carcass, said spring member beingnormally outside said cavity and cooperating with said 'mating'moldsections to completely enclose said cavity when said mold sections areclosed, and means for heating said sections.

2. A device for moulding and mission belts of the rubberftype whichcomprises incombination-,,'a frame, a pair of mating mould sectionscarried upon said frame said sections when closed upon each otherproviding an annular mould cayityadapted for the reception of an endlessbelt carcass, the mould section defining the inner wall of said annularmould cavity being provided with an annular recess opening into saidmould cavity, means in said recess and normally outside saidcavity forapplying radial pressure upon the belt carcass in said cavity comprisinga resilient rubber member movable into contact with said carcass, saidspring member and the mating mold sections cocuring trans- I plyingradial pressure upon the belt carcass in operating with each other to"define a substantially completely-enclosed mold cavity when said moldsections are closed, and means for heating said sections. f v i ,3. Adevice for moulding and'curing transmission belts, of therubber typewhich comprises cass, one section defining a portion of the inner wallof the cavity and the other section defining the outer wall of thecavity, the mould section defining the inner wall of said annular mouldcavity being provided with an annular recess opening insaid cavitycomprising a plurality of circumferentially spaced segments movableradially in said re- .cess, and a resilient member in said recess andnormally outside said cavity cincumsc'ribing said segments, said matingmold sections and said resilient member cooperating together todefine asubstantially completely enclosed mold cavity whensaid mold sections areclosed, and means for moving said segments radially outwardly to pressthe resilient member into contact with the belt carcass in said cavity,and means forheating said sections.

4. A device for moulding and curin transmission belts of the rubber typewhich comprises in combination, a frame, a pair of matingmould sectionscarried upon said frame saidsections when closed upon each othercomprising the defining walls of an annular mould cavity adapt- .ed forthe reception of an endless belt carcass, one section defining a portionof the inner wall of the cavity and the other section defining the outerwall of the cavity, the mould section defining the inner wall of saidannular mould cavity being provided with an annular :recess opening intosaid mouldcavity, means in said recess for applying radial pressure uponthe belt carcass in said cavity comprising a plurality oflcircumferentially spaced segments movable radially in said recess, anda resilient spring member in said recess and normally outside saidcavity circumscribing said segments, said mating mold sections and saidresilient member cooperating together to define a substantiallycompletely enclosed mold cavity when said mold sections are closed, andmeans for moving said segments radially outwardly to. press theresilient member into contact with the belt carcass in said cavity, andmeans for heating said sections. H

5. A device for moulding and curing transmission belts of the rubbertype which comprises in combination, a frame, a pair of mating mouldsections carried upon said frame said sections when closed upon eachother providing an annular mould cavity adapted for the reception of anendless belt carcass, the mould section defining the inner wall of saidannular mould cavity being provided with an annular recess opening intosaid mould cavity, means in said recess forv applying radial pressureupon the belt carcass in said cavity comprising, a plurality ofcircumferenitially spaced segments movable radially in said recess, anda resilient rubber 'member in said recess and normally outside saidcavity circumscribing said segments, said mating mold sections and saidresilient member cooperating-together ,todefine a substantiallycompletely enclosed mold cavity when said mold sections are closed, andmeans for moving said segments radially. outwardly to press theresilient member into contact with the beltcarcass in said cavity, andmeans for heating said sections. y 6. .'A device for moulding and curingtransmis sion belts'of the rubber type which comprises in combination,a, frame, a pair of mating mould sections carried'uponsaidframe saidsections ,when closed upon eachother comprising the defining; walls ofan annular mould cavity adapted for the reception of an endless beltcarcass, one section defining a portion of the inner wall of the cavityand the other section defining the outer wall of the cavity, the mouldsection defining the inner wall of said annular mould cavity being tosaid mould cavity, means in said recess for approvided with an annularrecess opening into aerate? said'mould cavity,tmeans'in2said recessiorapplyingzradialzpressure :upon the 'belt carcass in saidcavity'r'comprising aplurality ,ofzcircumferentially spaced segments.movable radially in said recess, and atresilient member-in 'said recesscircumscribingxsaid :segments, said mating mold sections'andssaidresilient member cooperating to- "gather to e define ta substantially"completely enclosedranold cavity when :said mold sections are closed,said resilient .member being rnormally under-circumferential rtension,andbeing nor- .mallyxoutside-"said *cavity, and 'means 'for moving saidsegments radially outwardly to pressthe resilientimemberintotcmitactwiththe belt car- "cass sinsaid cavity, Fan-d means forheating said sections.

17. A :device for :mouldingand curing transmission ibelts-ofttherubber'type which comprises combination, a=fra1ne, a pair oi'matingimould sections -.carried upon said .-'frame said sections when rclosed(upon :each other comprising the defining-walls ofaneannularmould cavityadapted forthe receptionof anendless'belt carcass, one section.zdefining a portion of the inner "wall :of

the :'cavityt:and :the other :section defining "the outer wall ofv'thecavity, the mould-section definingtheinner Wallof saidannular mouldcavity being provided with an annular recess opening into *said mould=cavity, means in said recess for applying radial pressure upon the beltcarcass in said cavity comprising -a plurality of circumferentiallyz-spaced sg'ments movable radially in 'sai'd'recess'and aresilientmember in said recess and normally outs'idesaid cavitycircumscribing said segments, said mating 'mold sections and saidresilient member cooperating together to definea substantiallycompletely enclosed mold "cavity when said mold sections are closed, and

means for moving said segments radially outwardly to press the resilientmemberinto'contact with the "belt carcass in said cavity, comprisingrodspositioned'radiallyinapertures in said recessed section, said'rodsbeing secured to said segments, means for moving said rods radiallyto'move =said segments, and means 'for heating said sections.

8. -A device for moulding and curing transmission belts of-therubbertype which comprises incombination, a frame, a pair of mating mouldsections carried upon said frame said sections when closed upon eachother comprising the defining Walls of an annular mould cavity adaptedfor the reception of an endless belt carcass, one section defining aportion "of "the inner wall of the :cavityand the other section definingthe outer wall'of, the cavity, the mould section defining the inner'wall ;of said .annular :mould cavity being provided 'with an annularrecess opening into said mould cavity, means in said recess for applying:radial pressure ,uponthe 'belt carcass insaid cavity comprising aplurality, of circumferentially spaced segments movable radially in saidrecess, and a resilient member in said recess and normally outside saidcavity circumscribing said segments, said mating moldsec- 'tions andsaidresilient member cooperating together'to define a substantiallycompletely enclosed mold cavity when said mold sections are'olosed,-and'means for-moving said segments radiallyoutwardlyi-insaidxrecess toepress: theiresilient membeifiintoicontactwithitheibeltpcarcassiin said cavity,comprisingxrods;.positioned;radially in apertures: inisa'idnecessed'sectiomcsaid ".roids being securedto said =segments;fluid pressure meansfor moving saidzrods 'radially'fto- :mLOVeTSaidsegments, and rmeans ifO-l. heating, saidisections.

9. A device :forrmoulcling and. curing transmission beltsiof therubbertype eWhlCh comprises in combinationrairame,:a-pair :of matingmould sections "carried upon said frame said sections when closed :uponeach other-providing an .annu'lar mould ::cavity,; adapted :for thereception 10f an endless :beltzcarcass, the .mould section definingtheinn'er walliof 'said annular 'mould cavity being provided with anannular recess opening into said mould '=cavity;.-a*flexibletubularmember positioned in said recessvand normally outsidesaid--cavity,ameansz:ior-applying fiuidunder: pressureto said ,tubularmember 'tora'dially compress said carcass, said mating moldsections-gandrsaid tubular member cooperatingatogetheratozdefine asubstantially completely enclosedwmold .icavity .w-lien said-sectionszarewelosed, and means for heating saidfimould seotions.

10. A device for molding and curing transmission beltszoftherubberwtyperwhich comprises in combination, a frame, ;a ,pairofimatingf mold sections-carried upon :said frame, said'sectionscomprising thedefining walls-ore "completely enclosed annular moldcavity :adapted for the reception-clean endless belt carcass,.:onesection definingamortionioi the ..-inner wall -;ot the cavity and theother-section defining the outer :wall of the cavity, the .mold-sectiondefining the-inner wall of saideannular mold cavitybeingprovided with,an annular srecesszopening into said mold cavity, means in-saidlrecess.:ior applying-radial pressurempon the "belt carcass in said cavitycomprising aresilient member positioned in said reoess andnormally-outside said cavity, and .movable radially-outwardly "intocontact with :said carcass, said mating mold sections and said'resilientmember -cooperating.ltogether :to' -define a substantially completelyenclosed lmold cavity whensaid moldsections areclosed means-in saidrecessnfor urging said ,resilient mem ber; radially outwardly, and-means ior .heatin-g said mold sections.

ROBERT .J. GORECKI.

REFERENCES TGITED The ifollowing references are .of record in the fileofthis :patent:

UNITED STATES PATENTS

